Data Concepts |
DEVELOPER |
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Data Concepts |
DEVELOPER |
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PROIV recognises three types of data: alphanumeric, numeric, and wide (multi-byte). All data types have an associated set of operators that can be used on the data. PROIV associates a data type with constants, variables and expressions:
A constant is a literal representing a value of alphanumeric, wide, or numeric data.
A variable is an entity that can assume different values during function execution. The data type of a variable determines the values that the variable can assume.
An expression can comprise a constant or a variable, or a combination of these separated by operators. Every expression is associated with a data type.
An array (or table) is a collection of elements that are associated with a single variable name.
There are two ways to specify a PROIV Array:
If the array is stored in a file record, it is defined in the File Definition screen by specifying an array size for a file variable. The array is stored in each record of the file but may contain different values in each record.
If the array is needed in only one function, a scratch variable array is created using the DEFINE statement. All values in the array must be set up in the function and are lost when the function is exited.
Topic ID: 730001